A process of forming a structure by diffusion bonding and superplastic forming includes forming a pack from at least one skin sheet and at least one core sheet, placing the pack in a mould and heating it. A gas is injected between the skin sheet and the core sheet to urge the skin sheet against an internal...http://www.google.com.au/patents/US7134176?utm_source=gb-gplus-sharePatent US7134176 - Superplastic forming and diffusion bonding process
